WASHINGTON -- Tourists flocked to the monuments in the nation's capital Sunday to enjoy 50-degree temperatures before yet another winter storm was expected to dump up to a foot of snow on parts of the East Coast.

In the latest blast of a harsh winter, forecasters said a layer of ice and as much as 10 inches of snow was possible by the end of Monday in Washington and the Mid-Atlantic region, while up to 8 inches of snow was predicted across parts of southern Pennsylvania. Nearly a foot of snow was expected in parts of New Jersey.

"I'm over it," said Yasmon Hanks, 24, of Hampton, Va., echoing the thoughts of many who've been cooped up inside this winter. Hanks visited the Martin Luther King Jr. Memorial on the National Mall with her husband and children. She was happy to get outside, she said, because "I thought it was going to be way worse."

But more snow and ice, perhaps as much as 2 inches falling every hour, were on the way ahead of Monday's morning commute. By late Sunday afternoon, rain had moved into the Washington area, temperatures dropped and the city had declared a snow emergency beginning early Monday.

On Sunday night, the federal government announced that its Washington-area offices will be closed Monday. However, the U.S. Supreme Court was expected to be open and had arguments scheduled for Monday.

Across much of the nation, a round of wintry precipitation brought a mix of freezing rain and heavy snow to central and eastern states Sunday. Authorities warned of possible weather-related power outages and flight disruptions that could affect millions.

In Pittsburgh, snow began falling about dawn and was expected to taper off before another band of snow hit early Monday. Forecasters were expecting 3 to 6 inches total. Philadelphia was expected to get 4 to 8 inches through Monday.

Nearly 1,900 flights in the U.S. were canceled and another 1,863 delayed Sunday evening, according to flight tracking site FlightAware.com. The bulk of the problems were in Dallas, Chicago and Newark, N.J. Another 1,612 flights for Monday were also already canceled.

A suspension bridge over the Ohio River between Cincinnati and Kentucky was closed Sunday because of ice covering its hard-to-treat metal grid deck.

Freezing rain and sleet moved across Kentucky, making road travel treacherous. Parts of the state could receive up to 8 inches of sleet and snow through Monday.

In the Midwest, arctic cold temperatures hit Nebraska. Forecasters said Sunday's temperatures could set records.